摘要
辽东湾坳陷沙河街组湖成碳酸盐岩的形成环境,大致可以分为碳酸盐岩台坪、碳酸盐岩斜坡和碳酸盐岩断阶。碳酸盐岩的形成主要受古地形、物源、水深和底质等因素的控制;在地形较平坦、陆源碎屑少、水体较浅、底质较硬的环境里,有利于生物碎屑白云岩的形成。因本区生物碎屑白云岩的溶蚀孔隙很发育,其渗透率较高,岩石密度较小,声波速度较小,自然伽马较低。在地震剖面上其底界为强振幅反射,内部为低频空白反射,顶界为弱振幅低频反射。
The environment of formation carbonate rock in the Liadong bay includes plateform, slope and fault terrace. The formation of lake-carbonate rock is affected by the ancient morphology, source material, depth of water body and characteristics of bottom-rock, etc. It is favorable for the formation of biocarbonate rock in the environment, such as smooth terrain, less clastics, shallow water body and hard bottom-rock. They are high permeability, light in density, slow acoustic speed and lower γ, because there is a higher porosity in the biocarbonate rock. It is shown that there is strong bottomreflection in seismic record and no reflection within the biocarbonate rock, while the upper biocarbonate rock is characterized by lower frequency and small amplitude reflection.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1991年第6期32-39,共8页
Petroleum Exploration and Development
